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United States Patent |
5,711,656
|
Tsai
|
January 27, 1998
|
Aquarium pump having silencing effect
Abstract
An aquarium pump comprises an air cylinder provided therein with an air
admitting chamber, an air inputting chamber, an air outputting chamber, an
air discharging chamber, an air winding chamber, and an air cap. As the
air cap is actuated, the atmospheric air is drawn into the air cylinder in
which the speed of the atmospheric air is reduced by the winding air ducts
and the volute air ducts of the chambers. As the air cap is compressed,
the air is forced out of the air cylinder via an air output tube without
making noise.
Inventors:
|
Tsai; Hsien-tang (No. 4-1, Ta-Guang Street, Taichung City, TW)
|
Appl. No.:
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741324 |
Filed:
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October 29, 1996 |
Current U.S. Class: |
417/312; 417/412 |
Intern'l Class: |
F04B 039/12 |
Field of Search: |
417/312,412,472,540
181/230,207,208
210/416.2,169
137/854,519.15
|
References Cited
U.S. Patent Documents
3825374 | Jul., 1974 | Kondo | 417/413.
|
4137016 | Jan., 1979 | Itakura | 417/413.
|
4749003 | Jun., 1988 | Leason | 137/854.
|
4792293 | Dec., 1988 | Wang | 417/413.
|
5052904 | Oct., 1991 | Itakura et al. | 417/413.
|
5137432 | Aug., 1992 | Tsai | 417/413.
|
5360323 | Nov., 1994 | Hsieh | 417/413.
|
Primary Examiner: Thorpe; Timothy
Assistant Examiner: Korytnyk; Peter G.
Attorney, Agent or Firm: Pro-Techtor International
Claims
What is claimed is:
1. An aquarium pump comprising a cylinder provided in a bottom portion
thereof with an air admitting chamber, an air inputting chamber, an air
outputting chamber, and an air discharging chamber, said cylinder further
provided in a top portion thereof with an air winding chamber, said air
admitting chamber being in communication with atmosphere via an air inlet
thereof, said air admitting chamber being in communication with said air
inputting chamber via an indentation of said air inputting chamber, said
air outputting chamber being communication with said air discharging
chamber via an indentation of said air outputting chamber, said
discharging chamber being connected with an air output tube, said air
winding chamber provided with an air cap attached to an outer surface of
said air winding chamber, said air winding chamber further provided
therein with an air entry hole for communicating said air winding chamber
with said air inputting chamber, said air winding chamber still further
provided with an air exit hole for communicating said air winding chamber
with said air outputting chamber, said air entry hole and said air exit
hole provided respectively with a membrane for opening and closing said
air entry hole and said air exit hole;
wherein said air admitting chamber is provided therein with a plurality of
winding air ducts for reducing the speed of atmospheric air drawn into
said air admitting chamber;
wherein said air inputting chamber is provided therein with a plurality of
volute air ducts formed by a plurality of guide blades arranged spirally
for reducing the speed of the atmospheric air;
wherein said air outputting chamber and said air discharging chamber are
provided with a plurality of winding air ducts;
wherein said air cap is actuated to draw the atmospheric into said air
admitting chamber such that the speed of the atmospheric air is reduced by
said winding air ducts of said air admitting chamber, and that the
atmospheric air is drawn into said air inputting chamber before the
atmospheric air is further drawn into said air winding chamber via said
air entry hole;
wherein the atmospheric air in said air winding chamber is forced by the
compression of said air cap into said air outputting chamber via said air
exit hole of said air winding chamber before the atmospheric air is
discharged via said air output tube without resonance.
2. The aquarium pump as defined in claim 1, wherein said membranes of said
air entry hole and said air exit hole are located by a membrane mounting
rod and a locating jacket such that through holes of said membranes are
fitted over said membrane mounting rod engaging said air entry hole and
said air exit hole, and that said locating jacket is fitted over said
membrane mounting rod to prevent said membranes from sliding on said
membrane mounting rod.
3. The aquarium pump as defined in claim 2, wherein said through holes of
said membranes are provided respectively with a flange encircling said
through holes for reinforcing the structural strength of said through
holes of said membranes and for increasing the contact area between said
membranes and said membrane mounting rod and further for making said
membranes invulnerable to deformation.
4. The aquarium pump as defined in claim 1 further comprising a leg pad
provided at a top portion thereof with a fastening groove engageable with
a fastening portion of a base of said cylinder, said leg pad further
provided with a tapered body opposite in location to said fastening groove
and having a tapered support end, said tapered body further having in an
outer wall surface thereof a plurality of flexible grooves capable of
alleviating shock, said tapered body still further having a core hole for
preventing the transmission of shock waves from said base of said cylinder
to said support end of said tapered body and for eliminating internal
stress of said tapered body.
Description
FIELD OF THE INVENTION
The present invention relates generally to an aquarium pump, and more
particularly to a quiet aquarium pump.
BACKGROUND OF THE INVENTION
As shown in FIG . 1, art aquarium pump of the prior art has an air cylinder
10, which is provided in the bottom thereof with an air admitting cell 11
and an air conveying cell 12. The air admitting cell 11 and the air
conveying cell 12 are separated by a partition. The air cylinder 10 is
further provided in the tipper portion thereof with an upper air cell 13,
as shown in FIG. 2. The air admitting cell 11 is in communication with the
atmosphere via an air inlet 110. Now referring to FIG. 3, the upper air
cell 13 is provided with an air cap 20 attached to the outer portion of
the upper air cell 13. The upper air cell 13 is provided therein with an
air admitting hole 130 via which the upper air cell 13 is in communication
with the air admitting cell 11. The upper air cell 13 is further provided
therein with an air transporting hole 131 via which the upper air cell 13
is in communication with the air conveying cell 131. The air admitting
hole 130 is provided with a movable membrane 132, whereas the air
transporting hole 131 is also provided with the movable membrane 132. As
the air cap 20 is actuated, the atmospheric air is admitted to the air
cylinder 10 such that the atmospheric air enters the air admitting cell 11
via the air inlet 110 before the movable membrane 132 of the air admitting
hole 130 is pushed aside by the atmospheric air to allow the attmospheric
air to flow into the upper air cell 13. In view of the compression of the
air cap 20, the atmospheric air is transported through the air
transporting hole 131 to push aside another movable membrane 132 such that
the atmospheric air is admitted to the air conveying cell 12 from which
the air is pumped out by an air tube. When the atmospheric air is sent
from the air admitting cell 11 to the air conveying cell 12, the air flow
and the partition are subject to resonance capable of increasing the
intensity of the sound or noise. As a result, the prior art aquarium pump
described above is rather noisy when it is at work.
As illustrated in FIGS. 4 and 5, another prior art aquarium pump comprises
an air cylinder 14 which has in the bottom thereof an air chamber 15, an
air admitting valve cell 16, an air discharging valve cell 17, and an air
transporting cell 18. The air cylinder 14 has in the upper portion thereof
an air pumping chamber 19. The air chamber 15 is in communication with the
atmosphere via an air hole 150 and with the air admitting valve cell 16
via an 15 indentation 160 of the air admitting valve cell 16. The air
discharging valve cell 17 is provided with an indentation 170 via which
the air discharging valve cell 17 is in communication with the air
transporting cell 18 which is in turn connected with an air tube. The air
pumping chamber 19 is provided with an air cap 20 and is further provided
therein with an air admitting valve hole 190 via which the air pumping
chamber 19 is in communication with the air admitting valve cell 16, as
shown in FIG. 6. In addition, the air pumping chamber 19 is provided
therein with an air discharging valve hole 191 via which the air pumping
chamber 19 is in communication with the air discharging valve cell 17. The
air admitting valve hole 190 is provided with a valve piece 192, whereas
the air discharging valve hole 191 is provided with another valve piece
192. As the air cap 20 is actuated, the atmospheric air is admitted to the
air cylinder 14. The air is admitted to the air chamber 15 via the air
hole 150 and is then admitted instantly to the air admitting valve cell 16
via the indentation 160, thereby causing the valve piece 192 to be pushed
aside directly by the air, which is then admitted to the air pumping
chamber 19 via the air admitting valve hole 190. In view of the
compression of the air cap 20, the air is allowed to pass through the air
discharging valve hole 191 so as to push aside the valve piece 192 before
the atmospheric air is admitted to the air transporting cell 18 via the
indentation hole 170 of the air discharging valve cell 17. The atmospheric
air is finally pumped out via an air tube. The atmospheric air is admitted
to the air cylinder 14 without being buffered. The fast-moving air and the
inner wall of the air cylinder 14 bring about the resonance phenomenon
capable of intensifying the noise.
The Taiwanese Patent Nos. 158860 and 147687 disclose respectively an
aquarium pump having a buffer chamber for providing the silencing effect.
However, the aquarium pump must increase in volume in order to accommodate
the buffer chamber. The addition of the buffer chamber can result in an
increase in the production cost of the aquarium pump. Moreover, the shape
of the aquarium pump must be compromised in order to accommodate the
buffer chamber. Such a compromise can have a negative impact on the
marketability of the aquarium pump.
Furthermore, the air cylinder of the aquarium pump has an air cap 20 which
actuated by an electromagnetically-operated rockng arm 1, as illustrated
in FIG. 7. The atmospheric air is drawn into an air pumping chamber 19 via
the air admitting valve cell 16 and the air admitting valve hole 190 when
the air cap 20 is pulled upwards. If the air cap 20 is actuated to move
downwards, the air contained in the air pumping chamber 19 is forced out
from the output tube via the air discharging valve hole 191 and the air
transporting cell 18. The air admitting valve hole 190 and the air
discharging valve hole 191 are provided with a valve piece locating rod
193, a valve piece 192 and a position limiting jacket 194, as shown in
FIG. 8. The valve piece locating rod 193 is located in the midsegment of
the valve hole. The valve piece 192 is provided with a rod hole, as shown
in FIG. 9. The rod hole is fitted over the locating rod 193 before the
position limiting jacket 194 is fitted over the locating rod 193. The air
current is prevented from flowing back via the valve holes 190 and 191 in
view of the fact that the valve holes 190 and 191 are sealed off by the
valve piece 192. When the air cap 20 is pulled upwards, the valve piece
192 is curved upwards to open up the air admitting valve hole 190 so as to
allow the air to enter the air pumping chamber 19. On the contrary, when
the air cap 20 is pushed downwards, the valve piece 192 is curved
downwards by the compressed air which is contained in the air pumping
chamber 19. As a result, the air discharging valve hole 191 is opened up
to allow the air to be pumped out. The output of the air from the air
cylinder 14 persists as long as the rocking arm 1 keeps swinging.
It is therefore readily apparent that the air output efficiency of the
prior at aquarium pumps is dependent on the quality of performance of the
air cylinder of the pumps and the air resisting effect of the valve piece
of the air valve portion.
The air valve piece 192 of the air valve portion of the air cylinder of the
prior art aquarium pumps is a round flat membrane and provided with a
rather small contact area located between the rod hole 324 and the valve
piece locating rod 193. The contrast area serves as an adhering area,
which too small to bring about an excellent locating effect. In addition,
the thin valve piece 192 is easily deformed such that the effect of the
air flow resistance of the valve piece 192 is seriously undermined. Even
though the position limiting jacket 194 is used to assist the valve piece
192 to be located securely on the locating rod 193, the valve piece 192
can not be still located securely in view of the fact that the position
limiting jacket 194 can not be secured to a proper position locating rod
193. For example, if the position limiting jacket 194 is forced inwards
excessively, the periphery of the valve piece 192 is easily deformed, as
shown in FIG. 10. Moreover, if the position limiting jacket 194 is fitted
over the locating rod 193 such that the position limiting jacket 194 is
not in contact with the valve piece 192, it is very likely that the valve
piece 192 is bound to slide on the locating rod 193, and that the air flow
resistance of the valve piece 192 is therefore seriously undermined. For
this reason, it is very important that the proper fitting position of the
position limiting jacket 194 is checked carefully.
As shown in FIGS. 12 and 13, a prior art pump disclosed in the Taiwanese
Patent No. 172173 is provided with a leg pad for preventing the pump from
moving aside. The leg pad has a tapered bottom, as shown in FIGS. 12 and
13. However, such a leg pad as described above is ineffective in averting
the sliding of the pump. The leg pad 40 is provided with a locating hole
41, which is engaged with a fastening rod 51 of the pump base 50. The leg
pad 40 is incapable of averting the resonance. Another prior art leg pad
60 is illustrated in FIGS. 14 and 15 and is provided with a fastening
portion 61, which is engaged with a fastening hole 52 of a base 50. The
leg pad 60 has a tapered bottom having threads 63 for minimizing the
resonance. However, the leg pad 60 is incapable of absorbing effectively
the shock transmitted from the base 50. As a result, the problem of
resonance persists.
SUMMARY OF THE INVENTION
It is therefore the primary objective of the present invention to provide a
quiet aquarium pump, which comprises an air cylinder provided in the
bottom portion thereof with an air admitting chamber, an air inputting
chamber, an air outputting chamber, and an air discharging chamber. The
air cylinder is further provided in the top portion thereof with an air
winding chamber. The air admitting chamber is in communication with the
atmosphere via an air inlet of the air admitting chamber. The air
inputting chamber is provided with an indentation through which the air
inputting chamber is in communication with the air admitting chamber. The
air outputting chamber is also provided with an indentation through which
the air outputting chamber is in communication with the air discharging
chamber which is in turn connected with an air output tube. The air
winding chamber is provided with an air cap and an air entry hole through
which the air winding chamber is in communication with the air inputting
chamber. The air winding chamber is further provided with an air exit hole
through which the air winding chamber is in communication with the air
outputting chamber. The air entry hole and the air exit hole are provided
respectively with a stopping membrane. The air admitting chamber is
provided therein with a plurality of the curved air ducts, whereas the air
inputting chamber is provided therein with a plurality of volute air
ducts. The air discharging chamber is provided with a plurality of curved
air ducts. The atmospheric air is drawn into the air admitting chamber
such that the air speed is reduced by the curved air ducts of the air
admitting chamber so as to alleviate the noise. The air speed is further
reduced by the volute air ducts of the air inputting chamber when the
atmospheric air is guided into the air winding chamber via the air entry
hole. The air is then compressed by the air cap before the air is guided
into the air discharging chamber via the air outputting chamber. The air
noise is further reduced as the air is guided through the curved air ducts
of the air discharging chamber.
It is another objective of the present invention to provide a quiet
aquarium pump, which comprises a cylinder provided therein with a membrane
mounting rod, a membrane, and a membrane locating jacket. The membrane
mounting rod is fitted into the through hole of the membrane such that the
membrane is located securely by the membrane locating jacket. The membrane
is provided with a flange encircling along the fringe of the through hole
for securing the membrane to the membrane locating rod in such a manner
that the membrane is less vulnerable to deformation.
It is still another objective of the present invention to provide an
aquarium pump with a leg pad which is fastened at one end thereof with the
base of the aquarium pump and is provided at another end thereof with a
tapered body of a hollow construction. The tapered body is provided in the
outer surface thereof with a plurality of circular grooves capable of
absorbing shock to avert the sliding and the resonance of the aquarium
pump.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a schematic view of an air cylinder of a first prior art
aquarium pump.
FIG. 2 shows a schematic view of one side of the air cylinder as shown in
FIG. 1.
FIG. 3 shows a sectional view of the air cylinder as shown in FIG. 1.
FIG. 4 shows a schematic view of an air cylinder of a second prior art
aquarium pump.
FIG. 5 shows a schematic view of one side of the air cylinder as shown in
FIG. 4.
FIG. 6 shows a sectional view of the air cylinder as shown in FIG. 4.
FIG. 7 shows a schematic view of an air cylinder of a third prior art
aquarium pump.
FIG. 8 shows an exploded view of the air cylinder of the prior art aquarium
pump.
FIG. 9 shows a sectional view of the air cylinder in combination according
to the prior art aquarium pump.
FIG. 10 shows a schematic view of the air cylinder in a poor combination
according to the prior art aquarium pump.
FIG. 11 shows another schematic view of the air cylinder in a poor
combination according to the prior art aquarium pump.
FIG. 12 shows a schematic view of a leg pad of the prior art aquarium pump.
FIG. 13 shows a schematic view of the leg pad at work according to the
prior art aquarium pump.
FIG. 14 shows a schematic view of another leg pad of the prior art aquarium
pump.
FIG. 15 shows a schematic view of another leg pad at work according to the
prior art aquarium pump.
FIG. 16 shows a schematic view of the present invention.
FIG. 17 shows a schematic view of the bottom of an air cylinder of the
present invention.
FIG. 18 shows a schematic view of the top of the air cylinder of the
present invention.
FIG. 19 shows a sectional view of the air cylinder of the present
invention.
FIG. 20 shows a schematic view of the present invention at work.
FIG. 21 shows an exploded view of an air valve portion of the air cylinder
of the present invention.
FIG. 22 shows a scetional view of the air valve portion in combination
according to the present invention.
FIG. 23 shows a schematic view of the leg pad of the present invention.
FIG. 24 shows a schematic view of the leg pad at work according to the
present invention.
FIG. 25 shows another schematic view of the leg pad at work according to
the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
As shown in FIGS. 16 and 17, an aquarium pump embodied in the present
invention is composed of an air cylinder which is provided in the bottom
thereof with a slot 31 having an air admiring chamber 32, an air inputting
chamber 33, an air outputting chamber 34, and an air discharging chamber
35. The slot 31 is provided therein with a rubber pad 310. The air
cylinder 30 is further provided in the top thereof with an air winding
chamber 36, as shown in FIGS. 18 and 19.
The air admitting chamber 32 is provided with an air inlet 320 through
which the air admitting chamber 32 is in communication with the
atmosphere. The air admitting chamber 32 is in communication with the air
inputting chamber 33 through an indentation 330 of the air inputting
chamber 33. Similarly, the air outputting chamber 34 is provided with an
indentation 340 through which the air outputting chamber 34 is in
communication with the air discharging chamber 35, which is connected with
an air output tube 37.
The air winding chamber 36 is provided with an air cap 20 fastened
therewith and is further provided therein with an air entry hole 360
through which the air winding chamber 36 is in communication with the air
inputting chamber 33. The air winding chamber 36 is still further provided
with an air exit hole 361 through which the air winding chamber 36 is in
communication with the air outputting chamber 34. The air entry hole 360
is provided with a membrane 362, whereas the air exit hole 361 is provided
with a membrane 363.
The air admitting chamber 32 is provided therein with a first stopping
plate 321 which is located between the air entry hole 320 and the
indentation 330 of the air inputting chamber 33. The air admitting chamber
32 is further provided therein with a second stopping plate 322 forming an
angle of 90 degrees along with the first stopping plate 321. In other
words, the air admitting chamber 32 is provided therein with the curved
and winding air ducts.
The air inputting chamber 33 is provided therein with four curved guide
blades 331, which are arranged spirally and unidirectionally such that two
adjoining guide blades 331 are provided therebetween with a protruded
portion 332. In other words, the air inputting chamber 33 is provided
therein with the volute air ducts.
The air discharging chamber 35 is provided therein with a third stopping
plate 350 which is located between the indentation 340 of the air
outputting chamber 34 and the air output tube 37. The air discharging
chamber 35 is further provided therein with a fourth stopping plate 351
which forms a plurality of winding air ducts along with the third stopping
plate 350.
In operation, the atmospheric air is drawn into the air cylinder 30 by the
action of the air cap 20, as illustrated in FIG. 20. As the air flows
through the winding air ducts of the air admitting chamber 32, the air
speed is reduced such that the air entry noise is alleviated, as
illustrated in FIGS. 17-19. As air flows through the indentation 330 of
the air inputting chamber 33, the air speed is further reduced before the
air current is guided by the protruded portion 332 to push away the
membrane 362 mildly in order to enter the air winding chamber 36 via the
air entry hole 360. The air entry noise is further alleviated. As the air
is compressed by the air cap 2O and the membrane 363 is pushed away, the
compressed air is guided to enter the air output tube 37 via the air exit
hole 361 and the indentation 340 of the air inputting chamber 34. As the
air flows through the winding air ducts of the air discharging chamber 35,
the air noise is reduced. As a result, the air cylinder 10 of the aquarium
pump of the present invention is relatively quiet when it is in operation.
As shown in FIGS. 21 and 22, the air entry hole 360 and the air exit hole
361 of the air cylinder 30 are provided with a membrane mounting rod 364,
membranes 362, 363, and a locating jacket 365. The membrane mounting rod
364 is located in the air entry hole 360 and the air exit hole 361 such
that the membrane mounting rod 364 is fitted into the through holes 366 of
the membranes 362 and 363, and the fitting hole 367 of the locating jacket
365. As a result, the membranes 362 and 363 are located securely on the
membrane mounting rod 364.
As shown in FIGS. 21 and 22, the through holes 366 of the membranes 362 and
363 are provided respectively with a flange 368 encircling the through
hole 366. The locating jacket 365 is of a caplike construction and is
provided with a fitting hole 367 of a predetermined depth. The flange 368
is capable of improving the air transporting efficiency in view of the
fact that the flange 368 enables the membrane 362 or 363 to return to its
original position to seal off the air entry hole 360 or the air exit hole
361 immediately after the passage of air through the air entry hole 360 or
the air exit hole 361. In addition, the flange 368 serves to reinforce the
structural strength of the through holes 366 such that the through holes
366 are not damaged by the mechanical friction between the walls of the
through holes 366 and the membrane mounting rod 364. Moreover, the flange
368 enables the membrane 362 or 363 to be located securely on the membrane
mounting rod 364 in view of the fact that the flange 368 increases the
contact area between the membrane 362 or 363 and the membrane mounting rod
364. Furthermore, the air entry hole 360 and the air exit hole 361 can be
sealed off precisely by the membranes 362 and 363, thanks to the flanges
368 which make the membranes 362 and 363 invulnerable to deformation.
The fitting hole 367 of the locating jacket 365 has a predetermined depth
and is therefore capable of being fitted over the membrane mounting rod
364 such that the membranes 362 and 363 are located with precision by the
locating jacket 365.
As shown in FIGS. 23 and 24, the aquarium pump, of the present invention is
provided with a leg pad 70, which is in turn provided at the top portion
thereof with a fastening groove 71 engageable with a fastening portion 52
of the base 50 of the aquarium pump of the present invention. The leg pad
70 has a tapered body 72 opposite in location to the fastening groove 71.
The tapered body 72 is provided with a support end 720 of a tapered
construction. The tapered body 72 is provided in the outer wall surface
thereof with a plurality of flexible grooves 721 capable of alleviating
the shock and is further provided with a core hole 722 for preventing the
transmission of the shock wave from the base 50 to the support end 720, as
illustrated in FIG. 25. As a result, the aquarium pump of the present
invention can be located securely on a smooth surface such that the pump
body is not caused to slide on the smooth surface, and that no resonance
is brought about. The core hole 722 of the tapered body 72 also serves to
eliminate the internal stress of the tapered body 72 of the leg pad 70 of
the present invention.
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